Started in 1988 Monthly
ISSN: 1006-7191
CN: 21-1361/TG
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China Association for Science and Technology
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Corrosion Resistance of Silane-Modified Hydroxide Zinc Carbonate Film on AZ31 Magnesium Alloy
Rong-Chang Zeng, Li-Jun Liu, Ting-Ting Pang, Fen Zhang, Wei-Wei Zhang, Shuo-Qi Li, Hong-Zhi Cui, En-Hou Han
Acta Metallurgica Sinica (English Letters)    2015, 28 (3): 373-380.   doi:10.1007/s40195-015-0208-x
Abstract49)   HTML0)    PDF (1637KB)(413)      
The corrosion resistance of magnesium alloys can be improved using functional surface modification such as hydrophobic treatment. In this study, a hierarchical hydroxide zinc carbonate (HZC) film was fabricated on AZ31 magnesium alloy via a simple chemical-bath deposition process using urea aqueous solution. The morphologies, compositions and corrosion resistance of the hydrophobic film were analyzed using scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectrometer, and electrochemical measurements as well. The results revealed that the HZC film displayed flower-like protrusions and had a thickness of approximately 100 μm. The fluoroalkylsilane (FAS)-modified HZC film exhibited a hydrophobic property with a water contact angle of 131.3°. The FAS/HZC film significantly improved the corrosion resistance of the AZ31 alloy due to hierarchical structures and hydrophobic modification.
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Cited: Baidu(18)
In-situ Tension of Dendrite-Reinforced Zr-based Metallic-Glass-Matrix Composites
Yang Huijun, Qiao Junwei, Wang Song, Zhang Yong
Acta Metallurgica Sinica (English Letters)    2014, 27 (4): 621-626.   doi:10.1007/s40195-014-0105-8
Abstract109)   HTML0)         

The evolution of shear bands in the glassy matrix composites was observed and analyzed during in-situ tension. Based on the simple calculation, the temperature rise within the shear bands is sufficient to cause the formation of viscous shearing layer, resulting in the early failure. Zr-based metallic-glass-matrix composites (labeled as DH1 and DH2) exhibit improved tensile ductility rather than brittle failure, since the existence of secondary ductile dendrites promotes the impedance of prompt propagation of shear bands, evidenced by the multiplication of shear bands.

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Cited: Baidu(14)
Manufacture of Nano-Sized Particle-Reinforced Metal Matrix Composites: A Review
Dongshuai Zhou, Feng Qiu, Huiyuan Wang, Qichuan Jiang
Acta Metallurgica Sinica (English Letters)    2014, 27 (5): 798-805.   doi:10.1007/s40195-014-0154-z
Abstract28)   HTML1)    PDF (499KB)(471)      
Compared to the micro-sized particle-reinforced metal matrix composites, the nano-sized particle-reinforced metal matrix composites possess superior strength, ductility, and wear resistance, and they also exhibit good elevated temperature properties. Therefore, the nano-sized particle-reinforced metal matrix composites are the new potential material which could be applied in many industry fields. At present, the nano-sized particle-reinforced metal matrix composites could be manufactured by many methods. Different kinds of metals, predominantly Al, Mg, and Cu, have been employed for the production of composites reinforced by nano-sized ceramic particles such as carbides, nitrides, and oxides. The main drawbacks of these synthesis methods are the agglomeration of the nano-sized particles and the poor interface between the particles and the metal matrix. This work is aimed at reviewing the ex situ and in situ manufacturing techniques. Moreover, the distinction between the two methods is discussed in some detail. It was agreed that the in situ manufacturing technique is a promising method to fabricate the nano-sized particle-reinforced metal matrix composites.
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Cited: Baidu(11)
DAMPING BEHAVIOR OF ULTRAFINE-GRAINED PURE ALUMINUM L2 AND THE DAMPING MECHANISM
Z.M. Zhang, *, C.J. Xu, J.C. Wang , H.Z. Liu
Acta Metallurgica Sinica (English Letters)    2006, 19 (3): 223-227 .  
Abstract1161)      PDF (422KB)(963)      

Ultrafine-grained pure aluminum L2 with a mean grain size of 1.0μm was produced by equal channel angular pressing (ECAP) and annealing at 150℃ for 2h. Damping behavior of the alloy was measured using a dynamic mechanical thermal analyzer. The alloy had an excellent damping capacity Q-1 with the ambient value being 9.8×l0-3 at 1.0Hz when the strain amplitude was 2.0×l0-5. The damping behavior of the alloy showed a non-linear damping variation tendency, that is, with an increase in temperature and a decrease of frequency, the damping capacity of the alloy increased. The damping capacity increased with the strain amplitude when the strain amplitude was less than 4.6×l0-5. When the strain amplitude was higher than 4.6×10-5, the damping capacity became a constant and independent of strain amplitude. The high damping capacity was attributed to dislocation unpinning and a drag of dislocation on pinning points.

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Simulation of lattice orientation effects on void growth and coalescence by crystal plasticity
Mei YANG,Xianghuai DONG
Acta Metallurgica Sinica (English Letters)    2009, 22 (1): 40-50.   doi:10.1016/S1006-7191(08)60069-1
Abstract681)      PDF (38057KB)(868)      

A three dimensional rate-dependent crystal plasticity model is applied to study the influence of crystal orientation and grain boundary on the void growth and coalescence. The 3D computational model is a unit cell including one sphere void or two sphere voids. The results of three different orientations for single crystal and bicrystals are compared. It is found that crystallographic orientation has noticeable influences on the void growth direction,void shape, and void coalescence of single crystal. The void growth rate of bicrystals depends on the crystallographic orientations and grain boundary direction.

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Cited: Baidu(6)
Tribological Behaviors of Ni3Al Intermetallics with MoO3Multilayer Ribbon Crystal Prepared by Spark Plasma Sintering
Wenzheng Zhai, Xiaoliang Shi, Kang Yang, Yuchun Huang, Liping Zhou, Wenlong Lu
Acta Metallurgica Sinica (English Letters)    2017, 30 (6): 576-584.   doi:10.1007/s40195-017-0531-5
Abstract15)   HTML0)    PDF (10567KB)(106)      

This study reports that small amounts of MoO3 multilayer ribbon crystal (MoO3 MLRC) in Ni3Al intermetallics showed the decreased friction coefficients and improved wear resistance at different contact loads. Specifically, the friction coefficients (0.32-0.34) and wear rates [(2-4) × 10-5 mm3 N-1 m-1] are significantly reduced for Ni3Al at 2-8 N. A possible explanation for the friction and wear reduction is that MoO3 MLRC as a multilayer material shears easily in the tribo-layer during the sliding contact, and provides low friction. In addition, this MoO3 MLRC with excellent bending strength is found to dissipate shear stress and suppress severe plastic deformation under a cyclic stress, thus drastically improving wear resistance of Ni3Al.

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Cited: Baidu(3)
Ab Initio Calculation of the Elastic and Optical Properties of Al3Sc Compound
M. Song , D.H. Xiao
Acta Metallurgica Sinica (English Letters)    2007, 20 (6): 425-428 .  
Abstract1329)      PDF (414KB)(1554)      

The ab initio method has been performed to explore the elastic and optical properties of Al3Sc compound, based on a plane wave pseudopotential method. It can be seen that the calculated equilibrium lattice parameter and elastic constants are in reasonable agreement with the previous experimental data. The elastic constants satisfy the requirement for mechanical stability in the cubic structure of the Al3Sc compound. The optical property calculations show that a strong absorptive peak exists from 0-15eV and a relative small absorptive peak exists around 30eV. The form is caused by the optical transitions between high s, p, and d bands, and the latter results from the optical transitions from high s, p, and d bands to the low 2p band.

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Cited: Baidu(2)
Microstructure and Impression Creep Properties of Ca-Containing AS31 Magnesium Alloy
Mohammad Badri,Seyyed Mehdi Miresmaeili,Bahram Nami
Acta Metallurgica Sinica (English Letters)    2016, 29 (12): 1089-1097.   doi:10.1007/s40195-016-0491-1
Abstract9)   HTML0)    PDF (1640KB)(716)      

The effect of Ca addition on the microstructure and impression creep properties of AS31 magnesium alloy was investigated in the current study. The results showed that the microstructure of AS31 alloy is composed of α(Mg) phase, massive Mg17Al12 and some Chinese script Mg2Si compounds. Addition of 2 wt% Ca to AS31 alloy resulted in complete elimination of Mg17Al12 phase and formation of Al2Ca compound. Ca improved the alloy’s creep properties especially at higher temperature. Improvement in the creep properties was attributed to the elimination of soft Mg17Al12 and formation of thermally stable Al2Ca compound. According to the obtained stress exponent and creep activation energy, pipe diffusion climb-controlled creep was estimated as the dominant creep mechanism and Ca had no influence on the dominant mechanism.

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Cited: Baidu(1)
Enhancing the Antibacterial Efficiency of ZnO Nanopowders Synthesized by Combustion Method Through Ag + Fe Co-doping
P. Sathish, K. Ravichandran, B. Sakthivel, A. Panneerselvam
Acta Metallurgica Sinica (English Letters)    2015, 28 (11): 1407-1413.   doi:10.1007/s40195-015-0340-7
Abstract49)   HTML1)    PDF (1720KB)(323)      
(Ag + Fe)-doped ZnO nanopowders have been synthesized using combustion method. Ag doping level was kept as 2 at.%, and Fe doping level was varied from 3 to 6 at.%, and the structural, optical, surface morphological, and antibacterial properties have been investigated. The structural studies show that ZnO/(Ag + Fe) nanopowders have hexagonal wurtzite structure with a preferential orientation along the (101) plane. The FE-SEM images indicate that there is a gradual decrease in the grain size with the increase in the doping level of Fe, and the TEM images are correlated well with FE-SEM images. The XPS profile clearly confirms the presence of expected elemental composition. Photoluminescence studies reveal the presence of extrinsic defects in the material. Antibacterial activity of Ag- and Fe-doped ZnO nanopowders against Vibrio parahaemolyticus, Vibrio Cholerae, and Staphylococcus aureus bacteria was also investigated.
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Cited: Baidu(1)
Influence of Torsion Deformation on Textures of Cold Drawing Pearlitic Steel Wires
Ning Guo, Bo Song, Bing-Shu Wang, Qing Liu
Acta Metallurgica Sinica (English Letters)    2015, 28 (6): 707-714.   doi:10.1007/s40195-015-0251-7
Abstract28)   HTML1)    PDF (883KB)(1218)      
The influence of torsion deformation on textures of cold drawing pearlitic steel wires was investigated by twisting the wires to different number of revolutions. Macro-texture (over the entire wire cross section) associated with torsion deformation was investigated by X-ray diffraction, while micro-texture (near the wire surface) was characterized by EBSD. The results show that the ?110? macro-texture increases at the beginning of torsion and then decreases with increasing of torsion strain, while the ?110? micro-texture decreases linearly with increasing of torsion strain. The relationships between the ?110? fiber texture and the microhardness of the wires are also discussed.
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Cited: Baidu(1)
ISSN: 1005-0302
CN: 21-1315/TG
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